Q57 of 76 Page 118

Why is hydrogen peroxide stored in wax lined bottles?

H2O2 may undergo decomposition into H2Oif it is placed in contact with sunlight or with dust particles. So it is kept in wax lined coloured bottles.

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55

Why does water show high boiling point as compared to hydrogen sulphide? Give reasons for your answer.

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Why can dilute solutions of hydrogen peroxide not be concentrated by heating. How can a concentrated solution of hydrogen peroxide be obtained?

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Why does hard water not form lather with soap?

 59

Phosphoric acid is preferred over sulphuric acid in preparing hydrogen peroxide from peroxides. Why?